Serje ta' Fourier: Differenza bejn il-verżjonijiet
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:<math>\ ||F||^2= \sum_{n=-\infty}^\infty |F_n|^2 = \frac{1}{2\pi} \int_{-\pi}^\pi |f(x)|^2 dx \,</math> .
<math>||F||^2:=</math> [[Norma (matematika)|Norma]] bill-kwadrat
In partikulari għall-funzjoni preċedenti b’valuri reali ''f'' :
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